Grinding device



pl 39 w W. GRAFTON ET AL 295479442 GRINDING DEVICE Filed Oct. 2l, 1948ATTORNEY Patented Apr. 3, 1,951

@Umso srAr-Es ,PArENr ort-ice G DEVlGE Welterraftge:Dallas and Jsenh GYeung,

' Mesquite .Tee

Application etolgerim, 1945, :Serial N.o 55,7152

Cl. .5l-9.2)

This invention relates to grinding apparatus and ,it has partieelafreferente t $1.191@ er1 etupttlvetus adapted 'for attachment .to atfeeir and Adriven by lthe generator .thereof ,for sharpening vsickleblades and fior like uses.

The principal-initieert :Qi the inventieve is te T1erevvide a sickleVbladet.shaneener 1whiclfi njlaybe 4in,- stalledn a taol" fslelmle?atlQhm-DP if desired, `since Agits A,presence y on r,the vtr/alctor,will VAinterfere in no ,waywithlnormal fuseof Athe lt1 c,- tOr. This,is made" ,possible by @virtue Y0f th Geref ypactness Vof the ,grindingattachment and the ,fact that neither vQwertake-:Q 0.f the,r tar Iis,required to be employed t0 operate the attach ment. instead, theinvention'is A driven by; e generator of lthe .tractor vthrough -`a,,simple belt ,drive 4which .is ,readily Are rnm/abl`e when ithe atewtfachrnentis not in use.

:Another `Object .0f the invention is ft@ gretig? a grindinadevieeadapted ,te Ateatttlfie.d t@ the frame @fla tractoradiacentitsinward-'endend which consists of a mounting lfl will@ rises astandard supportingY a'grinding wheel 'and shaft, forwardly Vof ,whichis disposed for vertical reciprocation A Ja sickle blade supportactuated by a hand or foot operated lever for moving the blade against'the fgrindingwheel.

StillA anotherobject' of theinve'ntionis to pro- -vide-vmeans maintainedunderI spring Vtensionto permit the grinding Wheel toi yield to theVthrust of the blade :as ;the ,latter :is ,advanced thereagainst-tolocate the wheel v-with respect to the serrationsof the blade andthusavoid *fouling ,of 1the cutting edges of thaserrations.

ltion has further reference to, 'c,eijtain teatres oi' 4 accomplishrnentwhich ,will bfe'c ine apparent-as the description proceeds, taken indonnection with the, accompanying drawing .-,whereiI Figure 1 is a'.fragmentary iperspectiv e viewfof With the foregoing objects, in. view,the invena -tractor Vrshowing mounted .tner'eon a -`grfi'nc-lingmachineernbodying the invention.

-Figurez is a top planviewfand Figure 3 is a fragmentary end elevationalView, partly in sectionfshowing'the-means for yieldingl-y resistingmovements fof the grinding wheel Continuing with a moredetaileddescription of the drawing, reference numeral at); denotes a tractor onwhose frame l i the invention is adapted to be mounted, Yat one side ofthe engine l2.y

the braflets ,being Securedto the ,latter by .bolts e weldinaltogmetubmarmember ,is adjacent @ne the same as a plunger v A 6. Atransversiejba'i ,.375 .is atxed rto .the .upper @5120i 9th,@ plungerand ;of tige grindtllerefron in Operative relatiqnfto the ndine4-lwhee12.42. At .spaced ,'QQHS @hither-bal .l are sQlfIle suards ,3 8 ,whichserre adequately as letg-inersior ,the :permitting.thesarnetabemanuallymovedendmise v`as the serratpns whereof are successively sharpened bycontact with the grinding wheel. A lug 39 is arranged on the bar 3lopposite the guards 38 as a Complementary means for reJ taining thesickle blade on the bar.

To raise the blade 23 into engagement with the grinding wheel, thetubular plunger guide 35 is longitudinally slotted at i0 and alongitudinal rib 4l is welded to the plunger to slide in the slot of theguide, thus to prohibit rotative displacement of the plunger. Below themidsection of the guide is welded thereto an angular arm 42 and to theouter end of this arm is pivoted at 43 a pair of parallel links 44. Theopposite ends of these links are pivoted at to an operating handle 46ywhose inner end extends through the slot in the guide 35 to engage underthe lower end of the plunger 38, thus to lift the same when the oppositeend of the handle 46 is depressed by foot or hand. The blade supportingbar 31 is moved upwardly to bring the blade into engagement with thewheel 22 and the weight of the assembly lowers the same to allowshifting of the blade manually to new positions.

In order that the grinding wheel may yield slightly to the upward thrustof the blade 23 thereagainst, thus to preclude damage thereto in eventof improper setting, an arm 41 is welded at one end to the tubularelement I8, on which is mounted the standard !9. A hook 48,' having athreaded shank extending through an aperture in the mounting plate I3 isconnected to the outer end of the arm 41 by a nut 49 and depends belowthe plate I3. A compression spring surrounds the shank of the hook 48and the latter retains the lower end of the spring, the upper endthereof bearing against the underside of the plate I3.

It is apparent from the foregoing that when undue pressure is exerted onthe lever 48 to bring the sickle blade 23 too forcibly against thegrinding wheel 22, the tubular member I8 will rotate in the bearingsI'I, lifting the arm 4'! and compressing the spring 58. The spring willexpand when pressure on the grinding wheel is relieved, returning thelatter to its normal position.

Manifestly, the construction as shown and described is capable of somemodification and such modification as may be construed to fall withinthe scope and meaning of the appended claims is also considered to bewithin the spirit and intent of the invention.

What is claimed is:

1. In a grinding attachment for a tractor having an engine and generatora stationary .1

mounting plate adapted to be secured to the frame of the tractor injuxtaposition to said engine, a tubular member coextensive with andsupported by said plate and capable of limited oscillative displacementrelation thereto, an upright affixed to said tubular member andsupporting on its upper end a journal box, a shaft journaled in saidbox, a grinding wheel on one end of said shaft, a pulley on the oppositeend of said shaft, a jack shaft parallel with and supported by saidmounting plate and carrying a pulley on each end thereof, one of whichhas belt connection with the pulley of said shaft, a tubular guidemounted on and perpendicular to said mounting plate having alongitudinal slot therein, a plunger reciprocable in said guide, atransverse work supporting bar mounted on the upper end of said plunger,in operative relation to said grinding wheel, a lever pivoted to saidtubular guide and operable in the slot thereof to actuate said plungerand work supporting bar and means adapted to connect the companionpulley of said jack shaft with a pulley on said generator for drivingsaid jack shaft and said grinding wheel shaft from said jack shaft.

2. A grinding device comprising a mounting plate, a tubular membercoextensive with and attached to said mounting plate for limitedoscillation about its longitudinal axis, an upright mounted on saidtubular member, a transverse shaft supported on the upper end of saidupright, a grinding wheel on one end of said shaft, a pulley on theopposite end of said shaft, a tubular guide attached to and disposedperpendicularly with respect to said mounting plate, a plungerreciprocable in said guide, a work support mounted transversely on theupper end of said plunger, a lever pivoted to said guide forreciprocating said plunger to actuate said work support to dispose workthereon operatively in relation to said grinding wheel, a jack shaftsupported by and in parallelism with said mounting plate, meansv fordriving said jack shaft and means connecting said jack shaft and thepulley on said transverse shaft for operating the latter.

3. A grinding device comprising a mounting plate and a verticallydisposed, hollow guide supported thereby, a plunger reciprocable in saidguide, a work support carried by the upper end of said plunger, ahorizontal tubular member supported by said mounting plate foroscillation about its longitudinal axis, an upright on said tubularmember, a shaft supported rotatably by said upright in substantialparallelism with said work support, a grinding wheel on said shaft,means for raising said plunger to dispose work on said support inoperative relationship with said grinding wheel, an arm attached to anextending laterally from the tubular member and over said mountingplate, a hook having a shank depending from the outer end of said armthrough an aperture in said plate and a coil spring compressible betweensaid hook and said mounting plate adapted to resist oscillativedisplacement of said tubular member and means for rotating said grindingwheel shaft.

WALTER GRAFTON. JOSEPH G. YOUNG.

REFERENCES CITED The following references are of record in the file ofthis patenti-- UNITED STATES PATENTS

